Method for producing thermoplastic articles having thin double walls

ABSTRACT

A method for producing cup-shaped, double-walled thermoplastic articles having two parts, namely a jacket and a liner nested in the jacket to define the inner and outer walls of the article, wherein batches of liners and batches of jackets are concomitantly formed in separate sheet sections of thermoplastic material at separate forming stations and at least one formed sheet section is transferred to a position where the jackets and liners of respective batches are internested, the internested parts are then blanked or cut out at a blanking or punching station to separate each pair of internested jacket and liner units, and the internested jackets and liners of each separated pair are secured together by beading or welding.

United States Patent [191 Thiel [45] Oct. 23,1973

[54] METHOD FOR PRODUCING 3,142,599 7/1964 Chavannes 156/210THERMOPLASTlC ARTICLES HAVING i29 27 2 1e THIN DOUBLE WALLS 3,514,3625/1970 Chavannes 156/219 X [76] Inventor: Aliens W. Thiel, Ufestr. l5,Mainz 3,697,369 10/1972 Amberg et al. 156/244 X 21111 Rhein, Germany[22] pn Oct. 19 1970 Primary Examiner-William A. Powell [21] A l N 819'53 Attorney-Stranch, Nolan, Neale, Nies & Kurz Related (1.8.Application Data [57] ABSTRACT [63] Continuation-impart of Ser. No.742,285, July 3,

1968, b d d, A method for producing cup-shaped, double-walledthermoplastic articles having two parts, namely a 30 Foreign Applicationp i Data jacket and a liner nested in the jacket to define the APL 131968 Germany n P 17 78 2706 inner and outer walls of the article,wherein batches of liners and batches of jackets are concomitantly [52]Cl 156" 156,214 l56/245 formed in separate sheet sections ofthermoplastic ma- 156/250 156/267 156/459 156/500 156/523 terial atseparate forming stations and at least one [51] Int. CL... 1152b 31/04formed sheet Section is transferred to a position where 58 Field 61Search 264/88 89 90 92-101 the jackets and line respective bawhes are264/267 269 ls/lg 5 nested, the internested parts are then blanked orcut 214 267 6 out at a blanking or punching station to separate each 7pair of internested jacket and liner units, and the in- [56] ReferencesCited ternested jackets and liners of each separated pair are UNITEDSTATES PATENTS secured together by beading or welding. 3,205,123 9/1965Hornbostel 264/269 x 23 Clain1 ,.13 D ta wing Figures 1// l i s IPAIENIED um 23 ms SHEET 2 BF 4 2 P22, 8 L w Inventor ALFo/vs W. 771/51.7

A tto/weys PAPENIEDBIH 23 I975 SHEET 3 OF 4 Fig.

Inventor AL Fo/vs W. TH/EL A ttorneys PATENTEDncI 23 1913 3.767501 ISHEET 4 OF 4 Inventor ALI-0N6 W. TH/EL.

' JMM M M A fro/ways METHOD FOR PRODUCING THERMOPLASTIC ARTICLES HAVINGTHIN DOUBLE WALLS This is a continuation-in-part of application Ser. No.742,285 filed July 3, 1968, now abandoned.

FIELD OF INVENTION This invention relates to a process for theproduction of thin, double-walled, plastic articles such as cups orother forms of containers.

BACKGROUND For the production of double-walled articles, which are madefrom a synthetic substance such as a thermoplastic, it has been known toproduce separately a liner forming the inside wall of the article and ajacket forming the outside wall of the article, to nest these two partsone within the other, and then to connect them firmly with one anotherby beading around the open end. This mode of operation, however, istimeconsuming and is too expensive for mass produced articles.Therefore, proposals have also been made already to form a multiplicityof jackets and liners simultaneously in one sheet made of thermoplasticor other synthetic substance or in one section of a web made ofthermoplastic or other synthetic substance, whereby liners and jacketsare produced one after the other, each time on half of the formingsurface. In the succeeding punching or blanking station, both the linerand jackets are punched out and paired in a unit below it. The pairedliners and jackets are then internested. As a result, only half as manydouble-walled articles will be produced as compared with the number ofsingle articles that could be produced with the same shaping andprocessing machine in the same time.

SUMMARY OF INVENTION The method and apparatus of this invention differsfrom the foregoing proposals mainly in that several jackets and linersare formed in sets or batches in separate sheet sections of material,and these batches of jackets and liners are paired and then internestedbefore the jackets and liners are punched out. Following theinternesting step, each assembled pair of jackets and liners in the twopaired off batches are cut or punched out of the sheet material in onepunching operation. During this separation step the jackets and linersof each assembled pair may be securely joined to each other at the openedge or mouth.

By producing the articles according to this invention, the jackets andthe liners by virtue of being formed separately from one another may bemolded from separate materials. At the same time, the materials can bedifferent in composition and kind. Also, the materials can be ofdifferent thicknesses. For example, the jacket may have a greaterthickness as compared with that of the liners. The materials can also beof different color, so that afterwards the liners and the jackets of thearticles differ in their color.

In a particularly advantageous aspect of this invention, the parts ofthe article of the one type can be shaped in batches in a web made ofthermoplastic or other synthetic substance, whereby this web is keptintact and is guided until after the separation of the articles, whilethe article parts of the other kind are integral sections of sheet,which, if need be, are cut out from a web, are fed to the web passingthrough, and are assembled with the parts of the articles of the onekind shaped in that web. By retaining the one web until after theseparation of the articles is effectuated, the speedy, uninterruptedprogress of production will be guaranteed in a particularly simple, buteffective manner. The article parts of the other kind, at the same time,do not need to be molded a priori in a sheet-shaped material. It is alsopossible to shape the article parts of the other kind in batches insections of a web and to cut the web sections containing the batchesseparately and on all sides to provide severed web sections which arefed to the web with the article parts of the one kind.

The invention also contemplates the forming of batches of liners andjackets in separate web sections which are both severed and one or bothof the severed sheet sections are transferred to be superposed tointernest the associated liners and jackets. Similarly the inventioncontemplates forming the batches of liners and jackets in separateindividual sheet sections with one or both sheet sections beingtransferred to a superposed position where the associated liners andjackets are internested.

. The firm internesting of the liner in the jacket, which is required asa rule, can be realized'relatively simply within the framework of thisinvention. For this purpose, the internested sheet or web sections canbe pressed together for the firm assembly of the liners and jacketsduring the assembly of the article parts molded in them. It is alsopossible to press these sheet or web sections together during separationof the articles. Therefore, a firm assembly of the liners and thejackets is provided during the punch-out step.

Specific embodiments of the invention are described after the followingdescription of the drawings.

DESCRIPTION OF DRAWINGS FIG. 1 is a schematic plan view of the apparatusfor carrying out the production method according to this invention;

FIGS. 2 to 5 each show the consolidation or assembly station in verticalsection as taken substantially along lines lI-II of FIG. 1, with adifferent embodiment being illustrated in each Figure;

FIG. 6 shows the separating station in a vertical section as takensubstantially along lines VIVI of FIG.

FIG. 7 is an enlarged fragmentary, diagrammatic view of the edge area oftwo assembled liners and jackets and of the interconnecting scrap, webarea of the sheets;

FIG. 8 is a vertical section taken substantially along lines VIIIVIII ofFIG. 1 and illustrating the edge rolling station;

FIG. 9 shows a modified separation station and edge rolling station in avertical section;

FIG. 10 is an enlarged, fragmentary section of the edge area of themouth of the article in the region where the liner and jacket are joinedtogether;

FIG. 1 1 is a schematic view like FIG. 1 showing a further embodimentwherein jackets and liners respectively, like in FIG. I, are formed inthe leading end sections of separate continuous webs, but wherein theformed sections are both severed and both are moved to a nestingstation;

FIG. 12 is also a schematic view like FIG. 1 showing a furtherembodiment wherein individual sheet sections at two separate formingstations are each formed with a batch ofjackets or liners, and one ofthe formed sections is moved to nest with the other; and

FIG. 13 is also a schematic view like FIG. 1 showing a furtherembodiment wherein individual sheet sections are each formed at onestation with a batch of jacket or liners, and a batch of jackets orliners is formed in the leading end of a continuous web at anotherstation to which the formed sheet section is transported as in the FIG.1 embodiment.

DETAILED DESCRIPTION Referring to FIG. 1, two molding machines 1 and 2are respectively provided with molding stations 3 and 4. Continuousstrip-like sheets or webs and 6, which are made of thermoplastic orother synthetic material are advanced respectively through stations 3and 4. In one embodiment, jackets indicated at 7 are shaped or molded insheet 5 at station 3, and liners indicated at 8 are shaped or molded insheet 6 at station 4.

Molding station 3 is provided with a multiplicity of jacket molds so\asto simultaneously form a corresponding number of jackets each time it isoperated. The simultaneously formed jackets constitute a single batch,and batches containing equal numbers ofjackets are successively formedas sheet 5 is advanced through station 3.

Likewise, molding station 4 has a multiplicity of forms or molds forshaping or molding a corresponding number of liners 8 in sheet 6. Thesimultaneously formed liners constitute a single batch, and batchescontaining equal numbers of liners are successively formed in sheet 6 asthe sheet is advanced through station 4. The jackets and linersrespectively shaped in sheets 5 and 6 are preferably arranged instraight rows.

Sheet 6, which is processed in molding machine 2 may be of a softer,and, if need be, more temperature resistant thermoplastic or othersynthetic material as compared with sheet 5. Moreover, sheet 6 can bethinner than sheet 5, since liners 8 can be drawn less deeply thanjackets 7. Also, the wall thickness of liners 8 may be less than that ofjackets 7.

Jackets 7 and liners 8, which are molded in the section of the sheets 5and 6 in each operational step of molding machines 1 and 2, arepreferably of the same number and have the same surface arrangementwithin the molded sections of sheets 5 and 6.

Behind station 3 a pair of roller slitters 9 are arranged on moldingmachine 1. Sheet 5 advances first through station 3 and then pastslitters 9 which trim sheet 5 laterally to a smaller width than sheet 6.Behind molding machine 1 there is a cross cutter 10, which cuts off thesections of sheet 5 each containing one batch of jackets which is formedin one operational step of molding machine l. Cross cutter 10 has twoparallel cutting arrangements for trimming the cut-off sheet sections 11in a transverse direction and to a somewhat smaller size as comparedwith that following an operational step of molding machine 1 or of anoperational step of equal size of molding machine 2. The severed sheetsections 11, produced in this manner and trimmed in each casecorresponding to one operational step of the molding machines, aresuccessively guided to sheet 6 at an assembly station by means ofaconveyor arrangement 12, and the batch of parts formed in each severedsection 11 are combined with the corresponding section 14 of sheet 6 atthe assembly station. The different methods of assembly will now bedescribed.

As shown in FIG. 2,jackets 7 and liners 8 according to one embodiment,are formed by machines 1 and 2 in an upward direction. Each severedsection 11, after it is trimmed, is guided laterally by means of rails13 until it is immediately above the uncut section 14 of sheet 6. Whenjackets 7 in section 11 have been aligned above section 14, rails 13 aremoved outwardly along the path shown by the double arrows 15. As aresult, section 11 drops onto section 14, thereby nesting jackets 7 overliners 8. For the purpose of providing a well seated assembly of jackets7 on liners 8, an insertion and impressing device 16 is verticallydisplaceable along the path shown by the double arrow 17. By movingdevice 16 downwardly, section 11 is pressed onto liner section 14. FIG.2 shows at its left a preceding section 14 which has seated thereon thepreceding section 11. At the right-hand end of FIG. 2 is the unassembledsection 14 which will receive the next section 11 that follows the oneshown in FIG. 2.

It is clear from FIG. 2, therefore, that successively formed sectionscontaining jackets 7 and indicated at 11 are sequentially seated on thesuccessively formed liner sections 8 which are indicated at 14 andwhich, at this stage, are still integral with sheet 6. Sheet6 togetherwith the sections 11 assembled thereon then are guided, as explainedlater, to an article separating device.

In the embodiment shown in FIG. 3, liners 8, instead of jackets 7. areformed at station 3 in sheet 5, and jackets 7, instead of liners 8, areformed at station 4 in sheet 6. The sheet sections 11, each containing abatch ofliners 8, are severed from the continuous sheet 5 and aretrimmed in the manner previously described. In this embodiment, jackets7 and liners 8 are molded downwardly so that their open ends faceupwardly. The thusly formed sections 11 are then guided by rails 13 overthe pertinent section 14 of sheet 6 to align liners 8 with jackets 7.Upon release of section 11 through an outward movement of rails 13,section 11 will drop onto section 14 to seat liners 8 in the jackets 7which are formed in section 14. In this example too, an arrangement forpressing sections 11 and 14 together may be provided. Such anarrangement conprises a pressure plate 19 which is moved in thedirection of the arrow 18, and a counter holding device 21, brought upfrom below and following the direction of arrow 20 to bear against thesheet section 14. In this example too, the successively formed sections14 of sheet 6 are covered with sections 11, and this assembly is guidedto the separation station. As shown, the sheet or web portions ofsections 14, which in this embodiment contain the batches of jackets 7,are not severed from sheet 6, and only the molded parts (jackets orliners, as the case may be) are cut out of sections 14 at the separationstation, leaving the remaining sheet or web portions of sections 14integral with sheet 6.

In the embodiment shown in FIG. 4, liners 8 are molded in batchesupwardly in sheet 5 to form sections 11, and the sections 11, eachcontaining a batch of thusly formed liners 8 are severed from sheet 5and then trimmed, all as previously described. In sheet 6, which isprocessed in molding machine 2, jackets 7 have been molded upwardly inthe corresponding sections 14. As compared with the examples of FIGS. 2and 3, sheet sections 1 1 are now successively fed below sections 14 andare lifted by means of a plate 22 to seat liners 8 in the correspondingjackets 7 thereabove.

Plate 22 is raised in the direction of arrow 23 to assemble sections 11on corresponding sections 14 in sheet 6.

As shown in FIG. 4 a counter-holding device 16 is disposed above sheet 6and is moved up and down in the direction shown by arrow 17. In thisexample too, sheet 6, when covered with sections 11 is then guided tothe separating device.

In the embodiment shown in FIG. 5, jackets 7 are molded in batchesdownwardly into sheet 5 to form sections 11, and sections 1 1, eachcontaining one batch of jackets, is severed from sheet 5 and trimmed inthe previously explained manner. In this embodiment, liners 8 are formeddownwardly in batches in sheet 6 to form successive sections 14, eachcontaining one batch of liners. In this example, sections 11, containingjackets 7, are fed to the assembly station below corresponding ones ofsections 14 in sheet 6 and are then lifted by means of a press device21, reaching between the jack ets and moving in the direction of arrowto be pressed over the liners 8 which are molded in section 14. For thispurpose a support plate 24 can be provided above sheet 6.

According to the invention, the severance of assembled pairs of jackets7 and linings 8 takes place jointly by cutting or punching throughsections 11 and 14 around the edges of jackets 7 and liners 8 along thelines indicated at 25 in FIG. 7. This can take place, for practicalpurposes and as the examples of FIGS. 6 and 9 show, by a punchingoperation.

As shown in FIG. 6, a punching device 26 acts from above and is locatedat a punching station which follows the assembly station shown in eitherFIG. 2 or FIG. 4. Below punching device 26, a punching table 27 hasopenings 28, through which the separated pairs of liners 8 and jackets 7drop together, as a result of having been punched out from sheet 6 andsections 11. The punched out liner and jacket pairs drop down to seat onstools 29. The liner and jacket of each pair seated on one of the stools29 are then firmly and securely connected with one another at the regionof their edges peripherally surrounding the open end of the article.This process of connecting can be accomplished preferably by rollingtogether the peripheral collars 30 and 31, ofjacket 7 and liner 8, whichto overlie as a result of the punching operation. A tool 32 for thispurpose is shown in FIG. 8 and is guided from above in the direction ofarrow 33 over the pairs of jackets 7 and liners 8 which are seated onstools 29. The construction and the mode of operation of such a tool areknown. See, for example, German Pat. No. 1,187,784. As a result of theforegoing operation, a

joined-flange connection is obtained between liner 8 and jacket 7 withcollar 30 being rolled within the bead on collar 31 as shown in FIG. 10.As a result of the previously described joint punching operation,collars 30 ofjackets 7 are somewhat wider than collars 31 of liners 8.However, this is not a disadvantage, for collar 30, as indicated at 34in FIG. 10, is rolled up a little further than collar 31 of liner 8.

Whenever liners 8 and jackets 7, as in the case of the examples shown inFIGS. 3 and 5, are molded downwardly, sheet 6 and sections 11, whichhave been put on sections 14, first require reversal if the separationand the firm connection of the jacket and liner pairs is carried outwith devices shown in FIGS. 6 and 8. FIG.

9 shows a construction which avoids such a reversing step.

For this purpose, a punching device 35 acts from below and is movedupwardly in the direction of arrow 35. To punching device 35, elevators37 have been attached, and elevators 37 are moved upwardly in thedirections of arrow 38 to lift the punched-out jacket and liner pairsthrough openings 38 in a punching table 39 and to guide them from belowonto stools 40. Stools 40 are attached to a carrier 42, which has acube-like shape surrounding an axis 41 and which is provided withsuction devices in order to hold the jacket and liner pairs that havebeen put on the stools. By swinging carrier 42 through arcs of or thejacket and liner pairs which are sitting on stools 40 are located sothat a tool such as edge rolling tool 32 can be guided over the jacketand liner pairs.

Instead of joining jacket 7 and liner 8 together by rolling or beadingcollars 30 and 31, the peripheral edges of liner 8 and jacket 7 may bewelded together. For this purpose, stools 29 or 40 could be used ascarriers for the jacket and liner pairs.

This invention provides for the production of doublewalled articles inthe same quantity as single-walled articles, without using two completesets of production lines for the purpose as had been considerednecessary.

In FIG. 11 continuous sheets or webs 5 and 6 are introduced into themolding machines, and they are formed at molding stations 3 and 4 withsuccessive batches of liners and jackets respectively. After leavingmolding station 3, the leading sheet sections 11 each containing a batchof liners are successively severed from web 5, and after leaving moldingstation 4 the leading sheet sections 11 of web 6 are severedsuccessively, each sheel section 11 containing an associated batch ofjackets. Batches of liners and jackets are formed simultaneously in theseparate webs. The corresponding severed leading sheet sections 11 and11' are moved into nested relation at 12. The nesting and followingoperations of cutting out the nested jacket-liner pairs and securingthem together permanently are the same as disclosed for the earlierembodiments.

In FIG. 12 at molding machine 1 a series of individual sheet sections 5are fed in succession to forming station 3 where they are each formedwith a batch of liners and fed forwardly to the position indicated at 11where they correspond to the severed sheet sections of liners of moldingmachine 1. Similarly at molding machine 2 a series of individual sheetsections 6' are fed in succession to forming station 4 where they areeach formed with a batch of jackets and forwardly'disposed at 14. Nowthe sheet sections 11 are transferred by a conveyor 12 into nestedrelation with the sheet sections 14', and the operations of securing thesheet sections together and cutting out the nested jacket-liner pairsand welding them together is accomplished as explained above.

In FIG. 13 at molding machine 1 a series of individual sheet sections 5'are introduced in succession, and at molding station 3 they are eachformed with a batch of liners and advanced to the position indicated at11 as in FIG. 12. At molding machine 2 a continuous sheet or web 6passes through molding station 4 where it is formed with a successiveseries of batches of jackets as in FIG. 1, and the sheet sectionscontaining each batch of jackets are severed from the web and disposedas sheet sections in the position indicated at 14'. Now

sheet sections 11 are moved to a nesting relation with sheet sections14' where they are combined as heretofore described, and then the nestedpairs ofjackets and liners are cut out and welded together as heretoforedescribed.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiments are therefore to be considered in all respects asillustrative and not restrictive, the scope of the invention beingindicated by the appended claims rather than by the foregoingdescription, and all changes which come within the meaning and range ofequivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by Letters Patent is:

l. A method of producing cup-shaped, double-walled articles fromsynthetic material wherein the outer wall of each article is defined bya jacket and wherein the inner wall of each article is defined by aliner nested in the jacket, said method comprising the steps of formingin a first forming station first sheet sections of synthetic sheetmaterial with each of said first sheet sections containing a batch ofsaid liners, forming in a second forming station second sheet sectionsof synthetic sheet material with each of said second sheet sectionscontaining a batch of said jackets, imparting relative motion betweenthe thusly formed first and second sheet sections to arrange first andsecond sheet sections at an assembly station with said liners nested insaid jackets, thereafter cutting out the individual nested pairs of theliners and jackets and then securing together the liners and jackets ofeach cut-out pair.

2. The method defined in claim 1, wherein said batches of liners andjackets are both formed in individual separate sheet sections.

3. The method defined in claim 1, wherein one group of said batches isformed in sheet sections that are integral portions of a continuous web,and the other group of batches is formed in individual separate sheetsections.

4. The method defined in claim 1, wherein said liners and jackets areformed from different thermoplastic materials.

5. The method defined in claim 1, wherein said liners are formed ofmaterial of less thickness than the material of said jackets.

6. The method defined in claim 1, wherein batches of liners are formedat substantially the same time as corresponding batches of jackets, inthe separate forming stations.

7. The method defined in claim 1, comprising the step of pressing saidnested first and second sheet sections together to securely seat thenested liners in said jackets.

8. The method defined in claim 1, wherein the jackets and liners of eachof said cut-out pairs are secured together along their edgesperipherally surrounding their open ends.

9. The method defined in claim 1, wherein one of said sheet sections isin overlying relation relative to the other of said sections when saidliners are nested in said jackets, and wherein said pairs are cut out ofsaid first and second sheet sections in one continuous motion, firstcutting through one of said sheet sections and then through the other ofsaid sheet sections without interruption.

10. The method defined in claim 1, wherein said liners and jackets areformed from materials of different colors.

11. The method defined in claim 1, wherein said liners are formed of asofter material than said jackets.

12. The method defined in claim 1, wherein the material of said linersis more resistant to temperature than the material of said jackets.

13. The method defined in claim 1, wherein said batches of liners areformed in sheet sections that are integral portions of a firstcontinuous web, and said batches of jackets are formed in sheet sectionsthat are integral portions of a second continuous web, and successivebatch containing sheet sections of at least one of said webs are severedand transported to nesting relation with the corresponding sheetsections of the other web.

14. The method defined in claim 13, wherein the successive batchcontaining sheet sections of both webs are severed prior to beingtransported to an assembly station.

15. The method defined in claim 1, wherein the sequence of one of saidsheet sections is trimmed longitudinally prior to transfer to saidassembly station.

16. The method defined in claim 15, wherein said sequence of one of saidsheet sections is laterally trimmed prior to said transfer.

17. A method of producing cup-shaped, doublewalled articles fromsynthetic material wherein the outer wall of each article is defined bya jacket and wherein the inner wall of each article is defined by aliner nested in the jacket, said method comprising the steps ofseparately providing a plurality of first sheet sections of syntheticsheet material and a plurality of second sheet sections of syntheticsheet material, advancing said first sheet sections through a firstforming station for forming a batch of said liners in each of said firstsheet sections, advancing said second sheet sections through a secondforming station for forming a batch of said jackets in each of saidsecond sheet sections, imparting relative motion between the thuslyformed first and second sheet sections to arrange first and second sheetsections at an assembly station with said liners nested in said jackets,thereafter cutting out the individual nested pairs of liners and jacketsand then securing together the liners and jackets of each cut-out pair.

18. A method of producing cup-shaped, doublewalled articles fromsynthetic material wherein the outer wall of each article is defined bya jacket and wherein the inner wall of each article is defined by aliner nested in the jacket, said method comprising the steps ofproviding separate, first and second continuous sheets of syntheticmaterial for respectively defining a plurality of first sheet sectionsand a plurality of second sheet sections, advancing said sheets throughseparate forming stations for forming a batch of said liners in each ofsaid first sheet sections at one of said stations and for forming abatch of said jackets in each of said second sheet sections at the otherof said stations, successively severing the formed sheet sections fromone of said sheets, imparting relative motion between the thusly severedsheet sections and the formed sheet sections of the other of said sheetsto arrange first and second sheet sections at an assembly station withsaid liner nested in said jackets, thereafter cutting out the individualnested pairs of liners and jackets, and finally securing together theliner and jackets of each cut-out pair.

19. The method defined in claim 18, wherein the formed sheet sections inthe other of said continuous sheets are maintained integral with saidother continu- 21. The method defined in claim 18, comprising the stepof pressing said first and second sections together to securely seat thenested liners in said jackets.

22. The method defined in claim 18, wherein the jackets and liners ofeach of said pairs are secured together along their edges peripherallysurrounding their open ends.

23. The method defined in claim 18, wherein one of said sections is inoverlying relation relative to the other of said sections when saidliners are nested in said jackets, and wherein said pairs are cut out ofsaid first and second sections in one continuous motion, first cuttingthrough one of said sections and then through the other of said sectionswithout interruption.

1. A method of producing cup-shaped, double-walled articles fromsynthetic material wherein the outer wall of each article is defined bya jacket and wherein the inner wall of each article is defined by aliner nested in the jacket, said method comprising the steps of formingin a first forming station first sheet sections of synthetic sheetmaterial with each of said first sheet sections containing a batch ofsaid liners, forming in a second forming station second sheet sectionsof synthetic sheet material with each of said second sheet sectionscontaining a batch of said jackets, imparting relative motion betweenthe thusly formed first and second sheet sections to arrange first andsecond sheet sections at an assembly station with said liners nested insaid jackets, thereafter cutting out the individual nested pairs of theliners and jackets and then securing together the liners and jackets ofeach cut-out pair.
 2. The method defined in claim 1, wherein saidbatches of liners and jackets are both formed in individual separatesheet sections.
 3. The method defined in claim 1, wherein one group ofsaid batches is formed in sheet sections that are integral portions of acontinuous web, and the other group of batches is formed in individualseparate sheet sections.
 4. The method defined in claim 1, wherein saidliners and jackets are formed from different thermoplastic materials. 5.The method defined in claim 1, wherein said liners are formed ofmaterial of less thickness than the material of said jackets.
 6. Themethod defined in claim 1, wherein batches of liners are formed atsubstantially the same time as corresponding batches of jackets, in theseparate forming stations.
 7. The method defined in claim 1, comprisingthe step of pressing said nested first and second sheet sectionstogether to securely seat the nested liners in said jackets.
 8. Themethod defined in claim 1, wherein the jackets and liners of each ofsaid cut-out pairs are secured together along their edges peripherallysurrounding their open ends.
 9. The method defined in claim 1, whereinone of said sheet sections is in overlying relation relative to theother of said sections when said liners are nested in said jackets, andwherein said pairs are cut out of said first and second sheet sectionsin one continuous motion, first cutting through one of said sheetsections and then through the other of said sheet sections withoutinterruption.
 10. The method defined in claim 1, wherein said liners andjackets are formed from materials of different colors.
 11. The methoddefined in claim 1, wherein said liners are formed of a softer materialthan said jackets.
 12. The method defined in claim 1, wherein thematerial of said liners is more resistant to temperature than thematerial of said jackets.
 13. The method defined in claim 1, whereinsaid batches of liners are formed in sheet sections that are integralportions of a first continuous web, and said batches of jackets areformed in sheet sections that are integral portions of a secondcontinuous web, and successive batch containing sheet sections of atleast one of said webs are severed and transported to nesting relationwith the corresponding sheet sections of the other web.
 14. The methoddefined in claim 13, wherein the successive batch containing sheetsections of both webs are severed prior to being transported to anassembly station.
 15. The method defined in claim 1, wherein thesequence of one of said sheet sections is trimmed longitudinally priorto transfer to said assembly station.
 16. The method defined in claim15, wherein said sequence of one of said sheet sections is laterallytrimmed prior to said transfer.
 17. A method of producing cup-shaped,double-walled articles from synthetic material wherein the outer wall ofeach article is defined by a jacket and wherein the inner wall of eacharticle is defined by a liner nested in the jacket, said methodcomprising the steps of separately providing a plurality of first sheetsections of synthetic sheet material and a plurality of second sheetsections of synthetic sheet material, advancing said first sheetsections through a first forming station for forming a batch of saidliners in each of said first sheet sections, advancing said second sheetsections through a second forming station for forming a batch of saidjackets in each of said second sheet sections, imparting relative motionbetween the thusly formed first and second sheet sections to arrangefirst and second sheet sections at an assembly station with said linersnested in said jackets, thereafter cutting out the individual nestedpairs of liners and jackets and then securing together the liners andjackets of each cut-out pair.
 18. A method of producing cup-shaped,double-walled articles from synthetic material wherein the outer wall ofeach article is defined by a jacket and wherein the inner wall of eacharticle is defined by a liner nested in the jacket, said methodcomprising the steps of providing separate, first and second continuoussheets of synthetic material for respectively defining a plurality offirst sheet sections and a plurality of second sheet sections, advancingsaid sheets through separate forming stations for forming a batch ofsaid liners iN each of said first sheet sections at one of said stationsand for forming a batch of said jackets in each of said second sheetsections at the other of said stations, successively severing the formedsheet sections from one of said sheets, imparting relative motionbetween the thusly severed sheet sections and the formed sheet sectionsof the other of said sheets to arrange first and second sheet sectionsat an assembly station with said liner nested in said jackets,thereafter cutting out the individual nested pairs of liners andjackets, and finally securing together the liner and jackets of eachcut-out pair.
 19. The method defined in claim 18, wherein the formedsheet sections in the other of said continuous sheets are maintainedintegral with said other continuous sheet throughout the steps ofimparting said relative motion to said first and second sheet sectionsto nest said liners in said jackets and of cutting out the nested linerand jacket pairs from said first and second sections.
 20. The methoddefined in claim 18, wherein said relative motion is effected bysuccessively transferring each formed severed sheet section to nestedrelation with the formed unsevered sheet section of the other sheet. 21.The method defined in claim 18, comprising the step of pressing saidfirst and second sections together to securely seat the nested liners insaid jackets.
 22. The method defined in claim 18, wherein the jacketsand liners of each of said pairs are secured together along their edgesperipherally surrounding their open ends.
 23. The method defined inclaim 18, wherein one of said sections is in overlying relation relativeto the other of said sections when said liners are nested in saidjackets, and wherein said pairs are cut out of said first and secondsections in one continuous motion, first cutting through one of saidsections and then through the other of said sections withoutinterruption.